Square.



M. CLARKE. SQUARE. APPLIOATION FILED MAY 13,1913.

LQ. Patente July 14, 1914.

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lVIATTHEW CLARKEy 0F WILKES-BARRE, PENNSYLVANIA.

SQUARE.

Specification of Letters Patent.

Patented July 14, 1914.

Application filed May 13, 1913. Serial No. 767,386.

two parts, including a main stock and a` supplemental stock, the latter being adjustably mounted upon the free end of l the former and movable toward and away from the same to vary the length of the stock as a whole and also detachable from the same to permit the use of the square with an exceptionally short stock, when desired.

A further object of my invention is to provide a trisquare, the'stock of which is provided upon its outer face or edge with a pair of adjustable gage arms which may be moved toward or away `from said stock p face, one of these gage arms being preferably mounted upon the supplemental stockj while the other is mounted upon the main stock in order that the gage arms may be moved toward and away from each other. And a still further object of my invention is to provide the blade of the tri-square with a plurality of longitudinally extending slots i providing a consequent plurality of longitudinally extending marking edges, the slots f being so proportioned and formed that t-he marking edges are spaced at a predeter mined distance from each other. In this connection one of the marking edges is provided with a plurality of notches equally spaced apart and adapted to seat a pencil point or the point of a scratch-awl to assist in marking out mortises` and the like.

Nit-h these and other objects in view, my

invention will be more fully described, illustrated in the accompanying drawing, and

then specifically pointed out in the claimsv which are attached to and form a part of this application. In the drawing: Figure 1 is a top pla view of the tri-square, the adjustable gage arms beingshown partially extended in dotted lines; Fig. 2 is an end elevation of' the tri-square, looking toward that end of the stock remote from the blade and showing one of the adjustable gage arms in extended position; Fig. 3 is a longitudinal sectional view taken through the stock on the line 3 3 of Fig. 1 and looking in the direction of the arrows.

Coresponding and like parts are referred to in the following description and indicated in all the views ofthe drawing by the same reference characters.

' My'improved tri-square, a preferred embodiment of which is shown in the drawing, incldes a blade .-10 fixed atone end to one end of a stock, indicated as a whole by the numeral l1, this stock including a main stock portion 12 and a supplemental stock portion 13. The blade 10, as shown in Fig. 8 of the drawing, has one end inserted in a slot formed in one end of the main stock portion 1l in which position it is secured by rivets or other suitable fastening devices 14, the blade being secured to extend at right angles to the stock as is customary. rlhe stock is preferably formed of wood, while the yblade is preferably formed of metal. either steel or brass, as preferred.

The blade may be of any suitable length and width and is provided with a pair of spaced apart longitudinally extending slots 15 and 16. The width of the blade and the width of these slots should be so proportioned that the portions of the blade between the slots will be predetermined fractional parts of an inch. For instance, the blade shown in Fig. 1 is assumed to be a blade two inches wide and the slots are so formed that the inner portion of the blade is one-half of an inch wide, the intermediate portion threeeighths of an inch wide and the outer portion ve-eighths of an inch wide. By this construction a plurality of marking edges are provided at predetermined distances from the outer edges of the blade, these edges greatly facilitating the cutting of gains for shelves, window frames and the like as by adding together the widths of certain of the portions of the blade between the slots and the widths of the slots, the user is enabled to mark almost any size gain up to two inches. The outer blade portion is marked oifin inches and fractions thereof as is customary and in addition to that the inner edge of said portion is notched as shown at 17, the points of the notches' coinciding in each instance with the divisional lines of the scale. These notches are of great use in marking out mor-Il tises and the like as the inner face of the drawn 'lengthwise of theboard drawing the pencil pointV or awl along the board and` marking the same, the engagement of the""" marking point in the notch insuring the marking of a line equidistant at all Vpoints z" from the edge of the boa-rd.

stock portion. The freeends of ,these arms extend a considerable dista-nce f beyond the inner end of the supplemental stock to seat 1 in the channels of the main stock and being of resilient metal and inclined toward each other sligh-tly they exert a frictional grips i ably bind the two stock portions together.r

ping force -upon the Amain stock to adjust- The free ends of thesek arms are slightly rounded at their corners'as shown at 22 to permit ready entering engagement of said ends in the outer ends of the channels 18 when assembling the parts. v

f 1t will of course be apparent that the stock portions may be made in any desired length and that the spring arms and'chan.-

' nels may be proportioned to give practically any desired range of adjustment by drawing the supplemental stock portion away from the main stock portion. These arms tit closely in their slots and prevent all swinging movement of one stock portion with respect to the other. At the same time this type of fastening permits the ready disconnecting of the supplemental stock from the main stock and the tri-square may there- 7 fore be used in cramped quarters with a stock considerably shorter than usual. assist in drawing the supplemental stock away from the main stock, the inner edge of the supplemental stock portion at that venol adjacent the free end of the main stock portion is cut-away as at 23 to furnish an opening in which theiinger of the operator. may

be inserted. 1 t

That end of the main stock in which the` blade is mounted and the free end of the supplemental stock are provided with ad- `versely formed channels 25 of the stock porj tions in the same manner in which the `arms 2O engage and the bight portion of which away fromA the outer edge of the stock. i

l Each of these gage armsV includes a U- i stock may be positioned against the edge of the board7 a pencil point or scratch-awl poj sitioned in the notch at the required dis-j tance from Athe stock and the stock then.

shaped body portion of spring metal 211, the sides of which frictionally engage in transseatsin a recess 25 formed in the outer vface 'of the stock to lie flush therewith. Each of these U-shaped portions or clamps 211 is provided with `a lateral extensionv 26 which,

v i in each instance, extends toward the vadja- As previously mentioned., the stock .of the 1 tri-square is formed in two-parts adjustably z connected. In ,carrying this out, the main stock portion 12 is provided in its upper and lower faces with longitudinally extending channels 18 and the supplemental stock is f similarly provided with channels 19 which, when the stock portions are placed in longi-- tudinal alinement with leach other, form conj tinuations of the ch-annels 18. Spring armsl 20 are secured by screws7 rivets .or other fastening devices 21 inthe channels of the sup.- y1 plemental stock in such a manner as =tolie j flush with the upper and lower faces of said cent end of the stock terminating in a laterally directed end 27. The outer face ofthe 'k stock' is vcut-away to receive the extensions `2G and seat the same flush with the remainder of the outer face of the stock andthe ends of the stock yare .cut-away to'receive the ends 427. It willtherefore be apparent that j when `these -gage armsv are in retracted position, their extensions 2G and ends 27 extend about the .outer corners of the stock to protect the wood of the same from splintering during use..

Each of theextensions 26 carries a thread.-

I,edstud 28 which extendsinto a socket 29 formed in the stock and the ends of the stock are slotted longitudinally to receive milled adjusting nuts 30 through which these studs are threaded. It will therefore be apparent that by rotating the nuts 30, the gage arms may be moved toward or away from the stock, as desired. The (adjustable gage arms form inthemselves a great improvement over the tri-.squares now in use, particularly when the tri-square is employed in putting on ysiding about window casings and the like, asthe outer face ofthe stock may be :placed against the `siding and the gage arms extended to bear against the outer edge o-f the frame and against the wall Vof the building. `When so positioned, a pencil or scratch-awl may berun along the side of the stock to mark the siding at the exact place 7 at which it should be cut. The tri-square may vbe employed with equal advantage, by extending but one of `these gage arms, in

marking baseboards ,andin cutting cross braces in doors and the like.

In order to insure as rigid an engagement 115 be apparent that I have Vprovided Va trisquare which isf'farsup'erior to those now in use for a number of different reasons, among which, are the provisionofa slotted blade, of a stock adjustable in length and adjustable gage arms carried by the stock.

It will of course 'be understood that I do ynot wish to limit kmyself to the specific de- 130 tails of construction illustrated in the drawing` and described in the above specification, as these show merely the pre-ferred embodiment of my invention, and all changes in construction, within the scope of the appended claims may be made at any time without in the slightest degree departing from the spirit of my invention.

Having thus described the invention, what is claimed as new is:

l. A tri-square including a blade, a stock provided at its free end with longitudinally extending channels in its upper and lower faces, a supplemental stock adapted to engage end to end with the main stock and provided in its upper and lower faces with channels in alinement with the channels of the main stock, and spring arms secured in the channels of the supplemental stock and seating by their free ends in the channels of the main stock.

2. A tri-square including a blade, a stock, and a supplemental stock` removable from t-he main stock, the main stock having channels formed in opposite faces and the supplemental stock having spring arms extending from its end for frictional engagement in the channel.

3. A tri-square including a stock, and a blade extending at right angles to the stock, said blade being provided with a plurality of spaced apart longitudinally extending` slots to provide spaced blade portions, one of said blade portions being marked off with scale divisions along its outer edge and having its inner edge notched with the points of the notches in alinement with the divisions of the scale.

4. A tri-square including a blade, a stock, and adjustable gage arms carried by the stock and means for moving said gage arms towzlird and away from the outer edge of the stoc z.

5. A tri-square including a blade, an extensible stock having a main stock portion and a supplemental stock portion slidably connected from movement toward and away from each other, and gage arms slidably carried one by the main stock portion and one by the supplemental stock portion for movement toward and away from the outer edges of their respective stock portions.

6. A tri-square including a blade, an extensible stock having a main stock portion and a supplemental stock portion movable toward and away from each other, both stock portions being provided with recesses and adjustable gage arms carried one by the main stock portion and one by the supplemental stock portion, said gage arms being movable toward and away from the outer Aedges of their respective stocks and in retracted position seating flush in the recesses formed in said stocks.

7. A tri-square including a blade, a stock cut-away at its ends to form seats and provided in its front and rear faces with transversely extending channels communicating with the seats, the ends of the stock being further slotted and provided with bores passing through the slots, adjustable gage arms including U-shaped portions, the arms of which seat in the channels of the stock, the intermediate portions of said gage arms being provided with lateral extensions seating in the seats of the stock, threaded studs carried by said extensions and projecting into the bores of the stock, and adjusting nuts positioned in the slots of the stock and through which the studs are threaded.

In testimony whereof I affix my signature in presence of two witnesses.

MATTHEl/V CLARKE. [Ls] Witnesses: v

JOHN P. PoLLocK, EDWARD GALVIN.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents.

Washington, D. C. 

